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current_hp = 12

game_over = false

current_hp is an integer indicates the player's current HP. game_over is a boolean that indicates if the player has lost or not. By default, game_over is set to false because no one wants to lose at a game the moment they just started.

I don't know what you're current code looks like so I'll just make assumptions. You're going to enclose the code that changes the data--player's position, enemies' position, score, etc--to inside an if-else in order to catch if the game is over or not.

if game_over: else:     Put your code that does stuff here

Now you that your code supports a game over, you must make a way for the player to reach that game over.

After moving the player and the enemies, update the player's current hp. I don't know what method you use to check if the player got hit so I'll just assume there is one.

if player_got_hit():     current_hp -= 1

Next, add a check that if the player's HP is 0, set the game_over to true.

if current_hp == 0:     game_over = true

Now that the player's HP is being updated, we're going to have to tell the player about it using an HP bar.

hp_meter = pygame.image.load("hp_meter.png") hp_cell = pygame.image.load("hp_cell.png") screen.blit(hp_meter, (50, 300)) for hp in range(1, current_hp+1):     screen.blit(hp_cell, (50,300-hp*hp_cell.get_height()))

The for-loop above loops from 0 to the player's current HP and draws a HP cell. Now this part, (50,300-hp*hp_cell.get_height()), tells the location of the particular HP cell.

Let's say the current HP is 3 and the size of the HP cell image is 30x24. So at 1, the location of the first cell will be at (50, 300-1*24) or (50, 276). At 2, the location of the second cell will be at (50, 300-2*24) or (50, 252). At 3, (50, 228)

Now modify the game_over if-statement to show a game over message.

if game_over:     font=pygame.font.Font(None, 24)     font.render("You Lost!".zfill(2), True, (255,255,255))     screen.blit(font, (200,200))